In this feature article, we use hydrophobic ferrite (FeO) nanocrystal shells filled with Au nanocrystals self-assembled into 3D superlattices and dispersed in water. These superstructures act as nano-heaters. The stability of such superstructures is very high, even for several years, when stored at room temperature. When subjected to an electron beam, the inverted structure of FeO structures is gradually dissolved due to the formation of hydrated electrons and hydroxyl radicals.
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